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Editing: Client.php

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<?php

namespace MaxMind\WebService;

use Composer\CaBundle\CaBundle;
use MaxMind\Exception\AuthenticationException;
use MaxMind\Exception\HttpException;
use MaxMind\Exception\InsufficientFundsException;
use MaxMind\Exception\InvalidInputException;
use MaxMind\Exception\InvalidRequestException;
use MaxMind\Exception\IpAddressNotFoundException;
use MaxMind\Exception\PermissionRequiredException;
use MaxMind\Exception\WebServiceException;
use MaxMind\WebService\Http\RequestFactory;

/**
 * This class is not intended to be used directly by an end-user of a
 * MaxMind web service. Please use the appropriate client API for the service
 * that you are using.
 *
 * @internal
 */
class Client
{
    const VERSION = '0.2.0';

private $caBundle;
    private $connectTimeout;
    private $host = 'api.maxmind.com';
    private $httpRequestFactory;
    private $licenseKey;
    private $proxy;
    private $timeout;
    private $userAgentPrefix;
    private $accountId;

/**
     * @param int    $accountId  your MaxMind account ID
     * @param string $licenseKey your MaxMind license key
     * @param array  $options    an array of options. Possible keys:
     *                           * `host` - The host to use when connecting to the web service.
     *                           * `userAgent` - The prefix of the User-Agent to use in the request.
     *                           * `caBundle` - The bundle of CA root certificates to use in the request.
     *                           * `connectTimeout` - The connect timeout to use for the request.
     *                           * `timeout` - The timeout to use for the request.
     *                           * `proxy` - The HTTP proxy to use. May include a schema, port,
     *                           username, and password, e.g., `http://username:password@127.0.0.1:10`.
     */
    public function __construct(
        $accountId,
        $licenseKey,
        $options = []
    ) {
        $this->accountId = $accountId;
        $this->licenseKey = $licenseKey;

$this->httpRequestFactory = isset($options['httpRequestFactory'])
            ? $options['httpRequestFactory']
            : new RequestFactory();

if (isset($options['host'])) {
            $this->host = $options['host'];
        }
        if (isset($options['userAgent'])) {
            $this->userAgentPrefix = $options['userAgent'] . ' ';
        }

$this->caBundle = isset($options['caBundle']) ?
            $this->caBundle = $options['caBundle'] : $this->getCaBundle();

if (isset($options['connectTimeout'])) {
            $this->connectTimeout = $options['connectTimeout'];
        }
        if (isset($options['timeout'])) {
            $this->timeout = $options['timeout'];
        }

if (isset($options['proxy'])) {
            $this->proxy = $options['proxy'];
        }
    }

/**
     * @param string $service name of the service querying
     * @param string $path    the URI path to use
     * @param array  $input   the data to be posted as JSON
     *
     * @throws InvalidInputException      when the request has missing or invalid
     *                                    data
     * @throws AuthenticationException    when there is an issue authenticating the
     *                                    request
     * @throws InsufficientFundsException when your account is out of funds
     * @throws InvalidRequestException    when the request is invalid for some
     *                                    other reason, e.g., invalid JSON in the POST.
     * @throws HttpException              when an unexpected HTTP error occurs
     * @throws WebServiceException        when some other error occurs. This also
     *                                    serves as the base class for the above exceptions.
     *
     * @return array The decoded content of a successful response
     */
    public function post($service, $path, $input)
    {
        $body = json_encode($input);
        if ($body === false) {
            throw new InvalidInputException(
                'Error encoding input as JSON: '
                . $this->jsonErrorDescription()
            );
        }

$request = $this->createRequest(
            $path,
            ['Content-Type: application/json']
        );

list($statusCode, $contentType, $body) = $request->post($body);

return $this->handleResponse(
            $statusCode,
            $contentType,
            $body,
            $service,
            $path
        );
    }

public function get($service, $path)
    {
        $request = $this->createRequest($path);

list($statusCode, $contentType, $body) = $request->get();

return $this->handleResponse(
            $statusCode,
            $contentType,
            $body,
            $service,
            $path
        );
    }

private function userAgent()
    {
        $curlVersion = curl_version();

return $this->userAgentPrefix . 'MaxMind-WS-API/' . self::VERSION . ' PHP/' . PHP_VERSION .
           ' curl/' . $curlVersion['version'];
    }

private function createRequest($path, $headers = [])
    {
        array_push(
            $headers,
            'Authorization: Basic '
            . base64_encode($this->accountId . ':' . $this->licenseKey),
            'Accept: application/json'
        );

return $this->httpRequestFactory->request(
            $this->urlFor($path),
            [
                'caBundle' => $this->caBundle,
                'connectTimeout' => $this->connectTimeout,
                'headers' => $headers,
                'proxy' => $this->proxy,
                'timeout' => $this->timeout,
                'userAgent' => $this->userAgent(),
            ]
        );
    }

/**
     * @param int    $statusCode  the HTTP status code of the response
     * @param string $contentType the Content-Type of the response
     * @param string $body        the response body
     * @param string $service     the name of the service
     * @param string $path        the path used in the request
     *
     * @throws AuthenticationException    when there is an issue authenticating the
     *                                    request
     * @throws InsufficientFundsException when your account is out of funds
     * @throws InvalidRequestException    when the request is invalid for some
     *                                    other reason, e.g., invalid JSON in the POST.
     * @throws HttpException              when an unexpected HTTP error occurs
     * @throws WebServiceException        when some other error occurs. This also
     *                                    serves as the base class for the above exceptions
     *
     * @return array The decoded content of a successful response
     */
    private function handleResponse(
        $statusCode,
        $contentType,
        $body,
        $service,
        $path
    ) {
        if ($statusCode >= 400 && $statusCode <= 499) {
            $this->handle4xx($statusCode, $contentType, $body, $service, $path);
        } elseif ($statusCode >= 500) {
            $this->handle5xx($statusCode, $service, $path);
        } elseif ($statusCode !== 200) {
            $this->handleUnexpectedStatus($statusCode, $service, $path);
        }

return $this->handleSuccess($body, $service);
    }

/**
     * @return string describing the JSON error
     */
    private function jsonErrorDescription()
    {
        $errno = json_last_error();
        switch ($errno) {
            case JSON_ERROR_DEPTH:
                return 'The maximum stack depth has been exceeded.';
            case JSON_ERROR_STATE_MISMATCH:
                return 'Invalid or malformed JSON.';
            case JSON_ERROR_CTRL_CHAR:
                return 'Control character error.';
            case JSON_ERROR_SYNTAX:
                return 'Syntax error.';
            case JSON_ERROR_UTF8:
                return 'Malformed UTF-8 characters.';
            default:
                return "Other JSON error ($errno).";
        }
    }

/**
     * @param string $path the path to use in the URL
     *
     * @return string the constructed URL
     */
    private function urlFor($path)
    {
        return 'https://' . $this->host . $path;
    }

/**
     * @param int    $statusCode  the HTTP status code
     * @param string $contentType the response content-type
     * @param string $body        the response body
     * @param string $service     the service name
     * @param string $path        the path used in the request
     *
     * @throws AuthenticationException
     * @throws HttpException
     * @throws InsufficientFundsException
     * @throws InvalidRequestException
     */
    private function handle4xx(
        $statusCode,
        $contentType,
        $body,
        $service,
        $path
    ) {
        if (strlen($body) === 0) {
            throw new HttpException(
                "Received a $statusCode error for $service with no body",
                $statusCode,
                $this->urlFor($path)
            );
        }
        if (!strstr($contentType, 'json')) {
            throw new HttpException(
                "Received a $statusCode error for $service with " .
                'the following body: ' . $body,
                $statusCode,
                $this->urlFor($path)
            );
        }

$message = json_decode($body, true);
        if ($message === null) {
            throw new HttpException(
                "Received a $statusCode error for $service but could " .
                'not decode the response as JSON: '
                . $this->jsonErrorDescription() . ' Body: ' . $body,
                $statusCode,
                $this->urlFor($path)
            );
        }

if (!isset($message['code']) || !isset($message['error'])) {
            throw new HttpException(
                'Error response contains JSON but it does not ' .
                'specify code or error keys: ' . $body,
                $statusCode,
                $this->urlFor($path)
            );
        }

$this->handleWebServiceError(
            $message['error'],
            $message['code'],
            $statusCode,
            $path
        );
    }

/**
     * @param string $message    the error message from the web service
     * @param string $code       the error code from the web service
     * @param int    $statusCode the HTTP status code
     * @param string $path       the path used in the request
     *
     * @throws AuthenticationException
     * @throws InvalidRequestException
     * @throws InsufficientFundsException
     */
    private function handleWebServiceError(
        $message,
        $code,
        $statusCode,
        $path
    ) {
        switch ($code) {
            case 'IP_ADDRESS_NOT_FOUND':
            case 'IP_ADDRESS_RESERVED':
                throw new IpAddressNotFoundException(
                    $message,
                    $code,
                    $statusCode,
                    $this->urlFor($path)
                );
            case 'ACCOUNT_ID_REQUIRED':
            case 'ACCOUNT_ID_UNKNOWN':
            case 'AUTHORIZATION_INVALID':
            case 'LICENSE_KEY_REQUIRED':
            case 'USER_ID_REQUIRED':
            case 'USER_ID_UNKNOWN':
                throw new AuthenticationException(
                    $message,
                    $code,
                    $statusCode,
                    $this->urlFor($path)
                );
            case 'OUT_OF_QUERIES':
            case 'INSUFFICIENT_FUNDS':
                throw new InsufficientFundsException(
                    $message,
                    $code,
                    $statusCode,
                    $this->urlFor($path)
                );
            case 'PERMISSION_REQUIRED':
                throw new PermissionRequiredException(
                    $message,
                    $code,
                    $statusCode,
                    $this->urlFor($path)
                );
            default:
                throw new InvalidRequestException(
                    $message,
                    $code,
                    $statusCode,
                    $this->urlFor($path)
                );
        }
    }

/**
     * @param int    $statusCode the HTTP status code
     * @param string $service    the service name
     * @param string $path       the URI path used in the request
     *
     * @throws HttpException
     */
    private function handle5xx($statusCode, $service, $path)
    {
        throw new HttpException(
            "Received a server error ($statusCode) for $service",
            $statusCode,
            $this->urlFor($path)
        );
    }

/**
     * @param int    $statusCode the HTTP status code
     * @param string $service    the service name
     * @param string $path       the URI path used in the request
     *
     * @throws HttpException
     */
    private function handleUnexpectedStatus($statusCode, $service, $path)
    {
        throw new HttpException(
            'Received an unexpected HTTP status ' .
            "($statusCode) for $service",
            $statusCode,
            $this->urlFor($path)
        );
    }

/**
     * @param string $body    the successful request body
     * @param string $service the service name
     *
     * @throws WebServiceException if the request body cannot be decoded as
     *                             JSON
     *
     * @return array the decoded request body
     */
    private function handleSuccess($body, $service)
    {
        if (strlen($body) === 0) {
            throw new WebServiceException(
                "Received a 200 response for $service but did not " .
                'receive a HTTP body.'
            );
        }

$decodedContent = json_decode($body, true);
        if ($decodedContent === null) {
            throw new WebServiceException(
                "Received a 200 response for $service but could " .
                'not decode the response as JSON: '
                . $this->jsonErrorDescription() . ' Body: ' . $body
            );
        }

return $decodedContent;
    }

private function getCaBundle()
    {
        $curlVersion = curl_version();

// On OS X, when the SSL version is "SecureTransport", the system's
        // keychain will be used.
        if ($curlVersion['ssl_version'] === 'SecureTransport') {
            return;
        }
        $cert = CaBundle::getSystemCaRootBundlePath();

// Check if the cert is inside a phar. If so, we need to copy the cert
        // to a temp file so that curl can see it.
        if (substr($cert, 0, 7) === 'phar://') {
            $tempDir = sys_get_temp_dir();
            $newCert = tempnam($tempDir, 'geoip2-');
            if ($newCert === false) {
                throw new \RuntimeException(
                    "Unable to create temporary file in $tempDir"
                );
            }
            if (!copy($cert, $newCert)) {
                throw new \RuntimeException(
                    "Could not copy $cert to $newCert: "
                    . var_export(error_get_last(), true)
                );
            }

// We use a shutdown function rather than the destructor as the
            // destructor isn't called on a fatal error such as an uncaught
            // exception.
            register_shutdown_function(
                function () use ($newCert) {
                    unlink($newCert);
                }
            );
            $cert = $newCert;
        }
        if (!file_exists($cert)) {
            throw new \RuntimeException("CA cert does not exist at $cert");
        }

return $cert;
    }
}

Editing: Client.php

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